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Grundfos 11 Sqf-2 Sqflex Solar Pump,11Gpm Nominal

Grundfos 11 Sqf-2 Sqflex Solar Pump,11Gpm Nominal
Grundfos 11 Sqf-2 Sqflex Solar Pump,11Gpm Nominal
Item code Model number
GRU11SQF-2 11 SQF-2

To avoid risk of voiding the warranty for the Flex Series pumps, use of a Grundfos control box is highly recommended.

SQFlex Pumps

SQFlex PumpsThe complete SQFlex pump range consists of 7 different pump sizes: 4 centrifugal and 3 helical rotor pumps. All pumps are fitted with the same size motor which, together with the new sizing tools, makes system sizing simple.

SQFlex - Features

SQFlex pumps have build-in protection features that protect the pump itself and in many cases the well. Among these features are:

  • Protection against dry-running, overloading and overheating
  • Automatic restart when water returns to the well or when the motor temperature returns to the safety range
  • Continuous load condition and voltage monitoring

SQFlex - Applications
With the advances in pump technology over recent years, areas that would previously have been considered uninhabitable or not supportive of life have become viable and attractive. With the new SQFlex system, Grundfos can consolidate these areas and pioneer further into new territories: Consolidating by upgrading older unreliable pump technology, and pioneering by providing more stable and low-maintenance pumping solutions in even more remote areas.

Potential SQ Flex applications include:

  • Live stock watering
  • Remote Homes
  • National/State Parks
  • Irrigation
  • Remote Camps
  • In locations where power is scarce and water is a necessity.
Model TDH Range (Ft.) Nominal GPM Length (In.) Output Size Pump Type
3 SQF-2 120 - 390 3 47 1” NPT Helical Rotor
6 SQF-2 120 - 390 6 48 1” NPT Helical Rotor
11 SQF-2 40 - 300 11 49 1 1/4” NPT Helical Rotor
25 SQF-3 0 - 40 25 33 1 1/2” NPT Centrifugal
25 SQF-6 0 - 60 25 35 1 1/2” NPT Centrifugal
40 SQF-3 0 - 20 40 37 2” NPT Centrifugal
75 SQF-3 0 - 40 75 39 2” NPT Centrifugal

Helical Rotor Pump

Based on original pumping principles, the helical rotor pump uses a few, simple components for effective pumping in high head and low flow conditions.

Technology based on 30 years' experience enables high flow in shallow water conditions. Stainless steel components give high wear resistance.
Centrifugal Pump


Stainless steel for long pump life.


Powerful carbon/ceramic bearing
system ensures extreme reliability.


Only one motor for the entire pump
range with built-in unique features.
A newly developed segmented stator
provides high efficiency.


The unique Grundfos micro frequency converter
ensures power transmission to the motor.


Maximum Power Point Tracking (MPPT)
means even and high system efficiency
regardless of power source.


Two-way communication between
interface box and pump eliminates the
needs for additional wires.


A wide voltage range enables the motor to operate
at any voltage between 30V and 300V DC or
90-240V AC, which makes installation and sizing
especially easy.

SQFlex - Energy Sources

In the middle of nowhere, the only things you can depend upon are air and daylight. The SQFlex pump is fully operational from only one or, for greater peace-of-mind, a combination of these energy sources. SQFlex Solar and Wind systems are reliable, low-mainteance and cost-effective. In addition, the systems are sustainable and totally environmentally sound.

Documentation for Download



SQ Flex Grundfos centrifugal or helical rotor quality system for about the cost of a diaphragm pump. The Grundfos SQ Flex pumping system can also be powered by a wind generator if you have the right site. The Whisper H-80 Waterpumper is the required generator. Features:
  • Up to 390 foot head applications
  • 30-300 VDC, or 90-240 VAC single-phase AC input
  • Permanent magnet high efficiency motor
  • Overload protection
  • Over temperature protection
  • Dry running protection
  • Maximum Power Point Tracking to optimize pump operation according to DC Power available
  • Power line communication with the CU200 (optional) to display operational conditions

Here are some tips from the altE staff

  • Can I use 240VAC to power the pump?
    • Yes, but for emergencies only. Grundfos does not recommend using 240VAC to power the pump over extended periods of time. If you do that, you risk burning out the pump motor. If you want to use 240VAC power as the primary power source, it is recommended that use a Lorentz with an AC adaptor. Using 120VAC with the SQFlex pumps is fine, but for heavier loads you will want to make sure operating the pump 120VAC provides sufficient power for the pump to handle the load.

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